申请人:——
公开号:US20030028036A1
公开(公告)日:2003-02-06
The invention relates to a method for producing compounds of general formula (I) wherein R
1
is selected from the following groups: (a) OR
5
and (b) mono-, di-, or tri-substituted phenyl; and R
2
represents a group (C
1
-C
6
) alkyl. The method is characterized in that it comprises the following steps: a) reacting a compound of general formula (II) with an acid of general formula R
1
CH
2
COOH (III) in a water-free medium; b) reacting the resulting compound with a strong base in an aprotic solvent in order to obtain an intermediate cyclic compound which forms a compound of general formula (I) after dehydration; and c) isolating said resulting compound of general formula (I).
该发明涉及一种制备一般式(I)化合物的方法,其中R1从以下组中选择:(a)OR5和(b)单取代、双取代或三取代苯基;R2代表(C1-C6)烷基基团。该方法的特征在于它包括以下步骤:a)在无水介质中将一般式(II)化合物与一般式R1CH2COOH(III)的酸发生反应;b)在无极性溶剂中用强碱使得产生的化合物发生反应,以获得生成一般式(I)化合物的中间环状化合物,该中间环状化合物在脱水后形成一般式(I)化合物;c)分离所得一般式(I)化合物。